Finding the Fourth Proportional to 1,722.16, 2,372.72 and 1,131.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,722.16 : 2,372.72 = 1,131.64 : x
2. Step 2: Convert to fraction form
   1,722.16/2,372.72 = 1,131.64/x
3. Step 3: Cross multiply
   1,722.16x = 2,372.72 × 1,131.64
4. Step 4: Simplify right side
   1,722.16x = 2,685,064.86
5. Step 5: Solve for x
   x = 2,685,064.86/1,722.16
6. Step 6: Final answer
   x = 1,559.13